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Analog ElectronicsActive Filters

An ideal first-order low-pass active filter has a cutoff frequency of 1 kHz. At frequencies far above cutoff, its magnitude rolls off asymptotically at approximately?

  • A-10 dB/decade
  • B-20 dB/decade
  • C-40 dB/decade
  • D+20 dB/decade
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Correct Answer: B. -20 dB/decade
Explanation: Each first-order pole contributes an asymptotic attenuation slope of about -20 dB per decade beyond the cutoff region.
Reference: Standard analog electronics: active filters
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